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Subject[PATCH 12/14] net: openvswitch: Annotate struct dp_meter with __counted_by
Date
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct dp_meter.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Pravin B Shelar <pshelar@ovn.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org
Cc: dev@openvswitch.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
net/openvswitch/meter.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/openvswitch/meter.h b/net/openvswitch/meter.h
index 013de694221f..ed11cd12b512 100644
--- a/net/openvswitch/meter.h
+++ b/net/openvswitch/meter.h
@@ -39,7 +39,7 @@ struct dp_meter {
u32 max_delta_t;
u64 used;
struct ovs_flow_stats stats;
- struct dp_meter_band bands[];
+ struct dp_meter_band bands[] __counted_by(n_bands);
};

struct dp_meter_instance {
--
2.34.1
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